Meditation is the practice of training attention: sitting quietly, returning again and again to a chosen focus and gradually becoming steadier. Many people begin expecting instant calm and are discouraged when the mind races. The Gita describes meditation in some detail, and its tone is patient: the mind is difficult, and practice works gradually, like learning any other skill.
Gita 6.25 says the restless mind should be patiently and gradually withdrawn from distractions and established in the Self, and not to expect instant concentration. Gita 6.10 recommends regular practice in solitude with a disciplined mind, free from unnecessary possessions and distractions, and Gita 6.13 recommends a steady posture and focused gaze, since a steady body helps cultivate a steady mind. Gita 6.12 says sitting steadily with a focused mind and controlled senses purifies the inner being.
The Gita also tells us what meditation needs. Gita 2.66 says that without a steady, disciplined mind there is no wisdom, no deep focus, no peace and so no lasting happiness. Gita 6.14 describes meditation done with purity, fearlessness and self-restraint, and Gita 6.15 says that consistency, not intensity, gradually brings lasting peace. Gita 4.29 describes conscious breathing as a form of discipline, and Gita 5.27 starts with turning attention inward. Begin with a few minutes each day.